I used to create one repository pr. aggregate, with a lot of query functions. Now I have a lot of reuseable specefications instead… nice.

I did use an abstract base class for my Specification/Criteria (instead of a ICriteria). By doing that I’m able to create a Generic IsSatisfiedBy that uses the exact same Linq expression:

public abstract class Specification where T : IAggregate
{
internal abstract IQueryable BuildQueryFrom(IQueryable queryBase);

protected bool IsSatisfiedBy(T aggregate)
{
IQueryable queryBase = (new List {aggregate}).AsQueryable();

return BuildQueryFrom(queryBase).Count() == 1;
}
}

: Thomas

very curious about the 3rd part. still not published? I couldn’t find it

/Peter

I would recommend considering 2 great DDD samples in C#:

1. C# port of Java DDD sample: http://code.google.com/p/ndddsample/ with this technology stack:
- NHibernate and Sql Lite
- Windsor Container
- Windsor WCF Facility
- WCF and
- Asp.NET MVC

2. There is yet another great architectural reference sample Domain Oriented N-Layered .NET 4.0 App Sample (Microsoft Spain): http://microsoftnlayerapp.codeplex.com/
Since this one is very robust I think it would be a great starting point for building NDDD sample including latest EF4 CTP4 features.

Thanks,
Rad